How is the scientific name of an organism written?

Which of the following is required for both laboratory and field studies?

The International Code of $Biological$ $Nomenclature$ is applicable to:

Arrange the taxonomic categories in the given figure such that the number of organisms decreases as we move from $W$ to $Z$.

Match the common names of organisms with their scientific names and select the correct option:

Common Name	Scientific Name
$(1)$ Modern Human	$(W)$ $Pheretima\,posthuma$
$(2)$ Extinct Human	$(X)$ $Zea\,mays\,L.$
$(3)$ Maize	$(Y)$ $Homo\,sapiens\,sapiens\,L.$
$(4)$ Earthworm	$(Z)$ $Homo\,erectus\,L.$

Identify the correct option for the following statements:
$(i)$ It represents a group at different levels in classification.
$(ii)$ It is a meaningful event for organisms.
$(iii)$ Organisms strive to achieve this for the maximum utilization of nature.
$(iv)$ Morphogenesis occurs during this process.